1665995325400 has 144 divisors (see below), whose sum is σ = 4556467128600. Its totient is φ = 564780142080.

The previous prime is 1665995325389. The next prime is 1665995325433. The reversal of 1665995325400 is 45235995661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 82854 + ... + 1827253.

Almost surely, 2^{1665995325400} is an apocalyptic number.

1665995325400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665995325400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2278233564300).

1665995325400 is an abundant number, since it is smaller than the sum of its proper divisors (2890471803200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665995325400 is a wasteful number, since it uses less digits than its factorization.

1665995325400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910226 (or 1910210 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 55.

The spelling of 1665995325400 in words is "one trillion, six hundred sixty-five billion, nine hundred ninety-five million, three hundred twenty-five thousand, four hundred".